Great suggestions here! Initially in the hospital, (day 2 after surgery) I wore a pair of my husband's old knit baggy gym shorts under his 'break-away' warm-up pants, that snapped up both legs. I figured the docs & nurses could access my knees pretty easily, and also could have the cryo cuff icing apparatus on both knees. For home, I had several pairs of stretchy sweat-type/lounge pants with straight, full legs and pockets. (some of the men's sleep pants work great!) Really liked the pockets for carrying my phone, pill containers, etc. as I moved from one area to another. The loose pant legs easily pulled up past my knees, and these were also my attire for all of my PT sessions, so the therapists could check, massage, etc. the incisions as necessary.
I also had Sketchers sneakers with the elastic laces that could just slip on and off (I used the elongated shoe horn - was great!!) They are so lightweight and have great traction.
Best wishes for your upcoming surgery!!